63 



20. Orchomene crispatus, (Groes). 



(PI. 23, fig. 2). 

 Lysianassa crispata, Goes, Crust, amphip. maris Spitsbergise, p. 3, fig. 3. 



Body very robust and plumpy, with broadly vaulted back. Cephalon 

 comparatively short, lateral corners greatly projecting- and acuminated \\\ 

 the tip. Coxal plates very large, the 4 anterior pairs nearly three times as 

 deep as the body and quite concealing laterally the buccal mass, f>th pair 

 fully as deep as broad. Last pair of epimeral plates of metasome rounded 

 at the infero-lateral corners, posterior edge straight and finely serrated 

 throughout. First segment of urosome without any dorsal projection. Eves 

 very narrow, oblong linear, pigment reddish brown with a light orange- 

 coloured coating. Superior antennse with the 1st joint of the peduncle 

 unusually narrow and elongated, almost as long as the whole remainder part 

 of the antenna, nagellum ( J-articulate with the 1st joint rather short, acces- 

 sory appendage slender, 6-articulate. Epistomal plate much broader than in 

 the 2 preceding species, but less projecting, obtusely truncated at the tip. 

 Anterior gnathopoda rather strong, propodos very elongated, much longer 

 than the carpal and meral joints combined, and gradually tapering to the 

 transversally truncated extremity. Basal joint of the 3 posterior pereiopoda 

 very much expanded, that of the last pair almost rectangular in form. Last 

 pair of uropoda with the rami comparatively coarser and broader than in the 

 other species. Telson short and broad, with 2 pairs of dorsal denticles, cleft 

 rather broad and not quite extending to the middle of the telson. Body 

 more or less distinctly flesh-coloured, especially on its anterior part, Length 

 of adult female reaching 12 mm. 



Eemarks. Boeck has erroneously identified the present form, 



detected by Groes, with his 0. serratus. As will be seen from the above 

 given diagnosis and the accompanying figures, it represents in reality a very 

 distinct species, differing from 0. serratus both as to the form of the body 

 and in several anatomical characters. It is now for the first time added to 

 the Norwegian fauna. 



Occurrence. - I have met with this form in a few localities off the 

 west coast of Norway and quite recently also in the Trondhjemsfjord. It 

 occurs, as a rule, in very deep water, especially in the region of the deep-sen 

 corals, depth from 100 to 200 fathoms. 



Distribution. - - Spitsbergen (Groes). 



